Mounting coupler



FIG. 1 is a front elevational view of a mounting coupler according to mynew design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is another front elevational view thereof;

FIG. 6 is another perspective view thereof; and,

FIG. 7 is still another perspective view thereof.

CLAIM The ornamental design for the mounting coupler, as shown.